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Old Sat, April 7th, 2012, 10:23 PM
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What are you looking at when judging coolant temperature? The PCM is not responsible for any coolant temperature gauge control and on an automatic transmission truck (assuming that's what you have), there isn't any coolant temperature input to the PCM anyway.


If you're looking at the gauge in the dash, it's controlled by a sending unit (not a switch), but I would still put very little faith in what it reads.